Update dependency css-loader to v7

Author: renovate[bot]

package.json

@@ -22,7 +22,7 @@
     "babel-preset-es2015": "6.24.1",
     "babel-preset-react": "6.24.1",
     "bourbon-neat": "1.9.1",
-    "css-loader": "0.28.11",
+    "css-loader": "7.1.2",
     "history": "2.1.2",
     "node-neat": "1.7.2",
     "node-sass": "3.4.2",